Spherical, void-free particle formation in spray-dried ferrites

Details Spherical, void-free particle formation in spray-dried ferrites Spherical, void-free particle formation in spray-dried ferrites

G - Physics

03

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31/133, 96/51

G03G 13/08 (2006.01) B01J 2/04 (2006.01) C04B 35/64 (2006.01) G03G 9/107 (2006.01) H01F 1/36 (2006.01)

Patent

CA 1054837

ABSTRACT OF THE DISCLOSURE Ferrite beads prepared via spray drying of a slurry of mixed oxides have characteristic voids or dimples present in the dried particles. This invention relates to the preparation of a slurry of ferrite forming metal oxides in a liquid wherein the slurry has a viscosity at about 23°C of between about 55,000 centipoise and about 140,000 centipoise, spray drying the slurry to form substantially spherical metal oxide beads, and sintering the beads to form ferrite particles which are continuous in sur- face area and free of interior voids. Electrostatographic develo per mixtures prepared with said ferrite materials and processes of developing electrostatic latent images therewith are also dis- closed.

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